Partition Table Entry Format

 
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Partition Table Entry Format

The format of partition table entry of any Partition in MBR has been given in the next table. Every Partition Entry of any MBR may be broken into the following bytes with their specific meanings:

 

Offset

Meaning

Size

Description

00H

Boot Type Indicator Byte

1 Byte

If Byte is 00H, the Partition is Inactive and if Byte is 80H, The Partition is Active (or Bootable)

01H

Head Number of Beginning of the Partition

1 Byte

Starting Head number of the Partition in Hexadecimal System

02H

Sector and Cylinder Number of Beginning of the Partition

2 Bytes

6 Bits of First Byte make Starting Sector Number and Combination of remaining 2 Bits (as Two Most Significant Bits) plus 8 Bits of another Byte (Rest 8 least Significant Bits of the 10-Bit Number ) make the Starting Cylinder Number of the Partition

04H

File System indicator Byte

1 Byte

File System Indicator Byte in Hexadecimal system

05H

Head Number of End of the Partition

1 Byte

Ending Head Number of the Partition in Hexadecimal System

06H

Sector and Cylinder Number of End of the Partition

2 Bytes

6 Bits of First Byte make Ending Sector Number and Combination of remaining 2 Bits (as Two Most Significant Bits) plus 8 Bits of another Byte (Rest 8 least Significant Bits of the 10-Bit Number ) make the Ending Cylinder Number of the Partition

08H

Absolute Sector number of Beginning of the Partition

4 Bytes

Number of Sectors Between the MBR and the First Sector in the Partition

0CH

Absolute Sector number of End of the Partition

4 Bytes

Number of Sectors in the Partition

Total = 16 Bytes

 

Writing program to read the partition table of MBR

The program to read all four partition entries from partition table of MBR has been given next. The program displays all the parameters of partition information, written in partition table of MBR.

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


Publishers of the Book
Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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